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Pydantic AI Updates: April 14, 2026

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1. PydanticAI v1.81.0 Launches Pydantic AI Harness with Monty-Powered Code Mode

Pydantic AI. PydanticAI v1.81.0 announced that Pydantic AI Harness is now live with Code Mode powered by Monty, a minimal, secure Python interpreter written in Rust that lets LLMs write Python code with loops, conditionals, and async calls instead of picking one tool at a time, executing in a zero-access sandbox. The release also includes five bug fixes across Anthropic compaction calculations, Prefect cache key computation, JSON schema boolean node processing, streaming tool call closure during errors, and Azure AI Foundry endpoint requests. Source